A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
A challenge either involving using logic-gates as the coding language or outputting logic gates.
a competition to solve a particular (usually simple) problem in the most bytes or complexity.
a number counting system using the digits 0—9 and A—F. Use this tag for challenges related to hexadecimal.
This challenge involves the manipulation of complex numbers, including parsing and printing them as well as performing complex arithmetic. This tag also encompasses generalised complex numbers like qu…
For challenges involving recursive functions, or functions or programs calling itself, directly or indirectly.
to write a solution using as many programming languages as possible.
related to the C# language. Note that challenges that require the answers to be in a specific language are generally discouraged.
"problems" presented to users, consisting of spelling/vocabulary challenges. The "problem" is solved when the user(s) decipher the correct spelling.
For questions that relate to probability or measurements, either outputting or parsing.
For challenges about rearranging a set of mathematical operators or numbers to fulfill a certain expression.
describes challenges related to factoring numbers and polynomials. Not related to the Factor esoteric programming language.
Challenge involving processing colors. It can be either for graphical output or manipulation on color codes.
for challenges involving integration or differentiation of functions.
For challenges relating in some way to encoding messages using classical (pen and paper) ciphers. For modern ciphers, such as AES, use the [encryption] tag instead.
Challenges relating to producing an audible output or an audio file which could then be played. If a challenge relates to textual representation of sound, it may fit better in [tag:music].
Challenges that involve summarizing a large amount of data in a single, much smaller number.
Challenges involving searching through some data to find a certain element or elements.
For challenges involving a small number of words, usually related to word generation. Do not use for "Hello, World!"-like challenges.
for challenges involving the game of tic-tac-toe (https://en.wikipedia.org/wiki/Tic-tac-toe).
for challenges which require answers to still work when a random edit to the source code is made.
For challenges concerning the Rubik's Cube or variations like the Pocket Cube.
For challenges related to programming or markup language syntax, including but not limited to checking syntax for validity, converting from one syntax to another or fixing invalid syntax. See also the…
related to Assembly language. Note that challenges that require the answers to be in a specific language are generally discouraged.
for challenges related to the functional programming paradigm.
themed around the new year.
Challenges related to the arrangement, layout, or formatting of monospace plain text.
A high-level data structure, made of nodes, each with a maximum of 2 children (left and right). Nodes with no children are called leaves, and two nodes with the same parent are known as siblings.
directly related to solving, creating, or otherwise working with sudoku puzzles.